将以下函数用script标记括起来，加到网页中

function clock(){
today = new Date();
hour = today.getHours();
min = today.getMinutes();
secs= today.getSeconds();

years=today.getYear();
months=today.getMonth()+1;
dates=today.getDate();
days=today.getDay();
if (hour< 10) {
hour= "0"+hour;
}
if (min< 10) {
min= "0"+min;
}
if (secs< 10) {
secs= "0"+secs;
}
time = hour + ":" + min + ":" + secs ;
tim.innerHTML=time;
yea.innerHTML=years;
mon.innerHTML=months;
dat.innerHTML=dates;
day.innerHTML=b;
window.setTimeout("clock();",900);
}
window.onload=clock

其中用到了innerHTML属性和setTimeout方法，然后
在网页的html标记中用id将时间显示在网页中。